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Metal-insulator transition in quasi-one-dimensional HfTe3 in the few-chain limit

  • Author(s): Meyer, S;
  • Pham, T;
  • Oh, S;
  • Ercius, P;
  • Kisielowski, C;
  • Cohen, ML;
  • Zettl, A
  • et al.
Abstract

The quasi-one-dimensional linear chain compound HfTe3 is experimentally and theoretically explored in the few- to single-chain limit. Confining the material within the hollow core of carbon nanotubes allows isolation of the chains and prevents the rapid oxidation which plagues even bulk HfTe3. High-resolution transmission electron microscopy combined with density functional theory calculations reveals that, once the triple-chain limit is reached, the normally parallel chains spiral about each other, and simultaneously a short-wavelength trigonal antiprismatic rocking distortion occurs that opens a significant energy gap. This results in a size-driven metal-insulator transition.

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